Home / 21,126.98-29,142.45-13,570.74

Finding the Fourth Proportional to 21,126.98, 29,142.45 and 13,570.74

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Solution

The fourth proportional to 21,126.98, 29,142.45 and 13,570.74 is: 18,719.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,126.98 : 29,142.45 = 13,570.74 : x
  2. Step 2: Convert to fraction form
    21,126.98/29,142.45 = 13,570.74/x
  3. Step 3: Cross multiply
    21,126.98x = 29,142.45 × 13,570.74
  4. Step 4: Simplify right side
    21,126.98x = 395,484,611.91
  5. Step 5: Solve for x
    x = 395,484,611.91/21,126.98
  6. Step 6: Final answer
    x = 18,719.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.